We at phelas are developing an electricity storage system to use solar and wind power even when the sun is not shining and the wind is not blowing. Our system Aurora uses a newly developed thermodynamic process to store energy in liquid air. Through this modular, affordable and sustainable technology, we pave the way towards a 100% renewable energy supply worldwide. phelas Aurora is a completely new thermodynamic storage system, that builds on the principles of liquid air energy storage (LAES). We use the strengths of LAES (no harmful materials, reliable components with high TRL, flexibility in scaling power and capacity independently) and adapt that to energy storage requirements.